Rudolf kronenberg



PATENTED JAN. 12, 1904.

R. KRONENBBRG. PERFORATING 0R PUNOHING APPARATUS.

APPLIOATIOR FILED FEB, 24. 1903.

N0 MODEL.

' RUDOLF KRONENBERG,

Patented January 12, 1904.

PATENT OFFICE.

OF oHLIes, GERMANY.

PERFORATING on PUNCHING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 749,303, dated January12, 1904.

Application filed February 24, 1908. Serial No. 144,798. (No model.)

- tical section of the apparatus, and Fig. 2 a plan view.

In the annular body I), with the foot I), exchangeable supporting-pins eare mounted one above the other in rows. The number of pins in each rowdepends on the diameter or crosssection of the material to be perforatedand also on the nature of the said material. For each row of pins a ringf is provided, which is adapted to be rotated by suitable means inproportion to the advance of the perforatingtoolfor instance, mandrel orpunch d. For each pin 6 in a row the respective ring f is provided witha recess f, which becomes deeper in the direction of rotation, therebyforming a cam, as shown in Fig. 2. The front surface of each pin 6 isshaped according to the cross-section of the material to be punched andthe rear surface according to the recess f, and the said surfaces are incontact with the block and the recess, respectively.

The stamp or punch 03 can be operated in any suitable manner.

The foot or pedestal b is provided with an aperture 0, into which thepunch d can enter.

the rings f, so that the rear ends of the pins enter the recess f,whereupon the pins are.

pressed against the block by rotating the rings. It is necessary toprovide space for the material displaced by the punch ol. For thispurpose the ring f belonging to the uppermost row of pins is firstgradually rotated until the pins 6 are at the deepest parts of therecess f This rotation of the ring and outward movement of the pin 6must take place in exact accordance with the advance of the punch, andso must, of course, the rotation of the following rings. If theperforation is continued through the entire block, all the rings willhave to be rotated, but if the perforation only takes place to a certaindepth only the rings to the corresponding level will be rotated.

With this apparatus the block remains perfectly straight during theoperation, since the displacement of material is uniform toward allsides, and the supporting and guiding of the block by the pins can takeplace at as short intervals as desired.

After the perforation has been produced and the perforated block or thelike removed from the body 6 the pins can be returned to their originalpositions by rotating or removing the rings f.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed,

I declare that what I claim is- The combination in a punching apparatus,of a stock-holding block, radial pins arranged in series longitudinallyof said block and adapted to engage the stock and rings provided withcams adapted to engage the pins in a series or around a circumferencewhereby the pins may be forced in to engage the stock and then releasedwith the forward movement of the punch to allow for the materialdisplaced thereby.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

RUDOLF KRONENBERG.

Witnesses:

A.LBERT KLEIN,

VICTOR W. HELDT.

